An antitheft alarm system for the oil or gas delivery pipeline is composed of a central station and several terminal stations. Said central station consists of display screen, computer, sound-light alarm, interface, radio data transmission module, printer, UPS, and stabilized DC power supply. Said terminal station is composed of audio sensor, amplifier, signal processor, A/D converter, single-chip computer, interface, radio data transmission module, solar battery, etc. It can sense the theft in time to generate audio-video alarm signals, preventing pipeline from being damaged.